Is the yellow different or just colored so somebody taking the piping apart
will know the piping is for gas (assuming that the original applier used
the yellow tape "properly")?
The yellow tape has a different formulation, it's made to resist the chemical
actions of gases.
Some states, localities (Tucson is one) forbid the use of copper pipe in
acetylene distribution systems. Iron pipe must be used (black type usually used
for gas). Evidently there is a long term corrosion problem.
Interesting in that I was talking with our local hardware dealer (ex
contractor) and we were looking at the Teflon tape, paste and string, all
white and none said anything about not using on gas. The paste and the
rope both stated for use on gas fittings amongst other places. The tape
said on all types of air, liquid, gases etc. The only "not to be used on"
statement was not to be used on certain hot caustics. The uniform building
code is evidently not too uniform!
John Dach and Cynthia Thomas
a div. of The thirst for knowledge,
MidLife Crisis Enterprises like that for water
PO BX 44 must be slaked.
Philo, CA 95466